Century leap year - wikipedia, In the gregorian calendar every year that is divisible by 400 is due to be an end-of-century leap year (often called a century leap year), with the intercalation of. Calendar converter - fourmilab, The islamic calendar is purely lunar and consists of twelve alternating months of 30 and 29 days, with the final 29 day month extended to 30 days during leap years.. The julian gregorian calendars - hermetic systems, The julian calendar, the gregorian reform and its adoption, astronomical year numbering, the julian and the gregorian proleptic calendars, and the accuracy of calendars..
The julian calendar - tondering, What julian calendar? julian calendar introduced julius caesar 45 bc. common late 1500s, countries started changing. http://www.tondering.dk/claus/cal/julian.php From julian gregorian calendar, The gregorian calendar introduced 1582, , countries changed julian calendar times.. http://www.timeanddate.com/calendar/julian-gregorian-switch.html Leap year - wikipedia, A leap year ( intercalary year bissextile year) calendar year additional day (, case lunisolar calendars, month. https://en.wikipedia.org/wiki/Leap_year